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Debt - Narrative (Details) - USD ($)
6 Months Ended
Dec. 31, 2020
Aug. 13, 2020
Jun. 30, 2020
Debt Instrument [Line Items]      
Notes payable $ 2,007,600,000   $ 2,008,400,000
Derivative, notional amount 1,000,000,000.0 $ 600,000,000.0 400,000,000.0
Unrealized loss on cash flow hedging instruments 43,600,000    
Fair value of notes issued $ 2,120,600,000    
Notes      
Debt Instrument [Line Items]      
Debt instrument, term 10 years    
Aggregate principal amount $ 2,000,000,000.0    
Fixed-rate 2.250% notes due September 15, 2020      
Debt Instrument [Line Items]      
Notes payable     $ 1,000,000,000.0